Calculation ofB0→K*0μ+μ−andBs0→ϕμ+μ−Observables Using Form Factors from Lattice QCD

2013/10/31 by R.R. Horgan, Ronald R. Horgan, Zhaofeng Liu +2 · 158 citations
Physics and Astronomy · #Crystallography #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ex #hep-lat #hep-ph

paper · pdf · doi:10.1103/physrevlett.112.212003

published in Physical Review Letters 112(21) (American Physical Society) · 6 pages. Updated form factors according to arXiv:1310.3722v3. New discussion of charmonium resonances. Accepted by PRL

arxiv created 2014/05/07 · openalex publication_date 2014/05/30 · arxiv updated 2014/06/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We calculate the differential branching fractions and angular distributions of the rare decays B⁰\ensuremath→K^*0\ensuremathμ⁺\ensuremathμ^\ensuremath- and B_s⁰\ensuremath→\ensuremathφ\ensuremathμ⁺\ensuremathμ^\ensuremath-, using for the first time form factors from unquenched lattice QCD. We focus on the kinematic region where the K^* or \ensuremathφ recoils softly; there, the newly available form factors are most precise and the nonlocal matrix elements can be included via an operator product expansion. Our results for the differential branching fractions calculated in the standard model are higher than the experimental data. We consider the possibility that the deviations are caused by new physics and perform a fit of the Wilson coefficients C₉ and C₉^\ensuremath' to the experimental data for multiple B⁰\ensuremath→K^*0\ensuremathμ⁺\ensuremathμ^\ensuremath- and B_s⁰\ensuremath→\ensuremathφ\ensuremathμ⁺\ensuremathμ^\ensuremath- observables. In agreement with recent results from complementary studies, we obtain C₉\ensuremath-C₉^SM=\ensuremath-1.0\ifmmode±\else\textpm\fi0.6 and C₉^\ensuremath'=1.2\ifmmode±\else\textpm\fi1.0, whose deviations from zero would indicate the presence of nonstandard fundamental interactions.

Citations

• Lattice QCD calculation of form factors describing the rare decaysB→K*ℓ+ℓ−andBs→ϕℓ+ℓ−
• Review of Particle Physics
• Bayesian fit of exclusive b → s ℓ ℓ decays: the standard model operator basis
• Weak radiative B-meson decay beyond leading logarithms

Cited by

• Rare B decays using lattice QCD form factors
• Towards the discovery of new physics with lepton-universality ratios of b→sℓℓ decays
• B→ρ helicity form factors within the QCD light-cone sum rules

Related

• Searching for New Physics with B⁰ → K^*0 μ⁺ μ^-
• Lattice QCD calculation of form factors describing the rare decaysB→K*ℓ+ℓ−andBs→ϕℓ+ℓ−
• Impact on L-observables of a new combined analysis of B_d,s→ K^(*) form factors
• Standard Model predictions for B→Kℓ+ℓ−, B→Kℓ1−ℓ2+ and B→Kνν¯ using form factors from Nf=2+1+1 lattice QCD
• Study of Form Factors and Observables in B_c^- → D^(*)0ℓ^-ν_ℓ and B_c^- → D^(*)-ℓ⁺ℓ^- decays